CN218331735U - Radiation refrigeration cooling power measuring device - Google Patents
Radiation refrigeration cooling power measuring device Download PDFInfo
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- CN218331735U CN218331735U CN202222090263.9U CN202222090263U CN218331735U CN 218331735 U CN218331735 U CN 218331735U CN 202222090263 U CN202222090263 U CN 202222090263U CN 218331735 U CN218331735 U CN 218331735U
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Abstract
The application belongs to the field of measuring instruments, and provides a measuring device for radiation refrigeration cooling power, which comprises a radiating fin, a heat conducting layer, a temperature difference resistor, a basal layer and a power instrument, wherein the radiating fin is arranged on the basal layer; the radiation refrigeration cooling device comprises a temperature difference resistance piece, a heat conduction layer, a heat dissipation sheet, a base layer and a radiation refrigeration cooling material layer, wherein the heat conduction layer is arranged on one side of the hot end of the temperature difference resistance piece; the radiating fins, the heat conducting layer, the temperature difference resistance piece and the basal layer form a temperature difference power generation piece; the power meter is connected with the hot end and the cold end of the temperature difference resistance element through leads to form a closed loop. Compare traditional cooling power tester this application need not extra power supply, need not to add extra controller and heater and can accomplish the power measurement, only need place the bed floor surface with the material to be measured, gathers electric power through the power appearance and can indirectly try to get radiation refrigeration cooling power, has simple structure simple operation's characteristics.
Description
Technical Field
The application belongs to the measuring instrument field, concretely relates to radiation refrigeration cooling power's measuring device.
Background
The main principle of radiation refrigeration is that the energy of a solar wave band (0.3-2.5 mu m) is reflected, meanwhile, the emissivity of an atmospheric window wave band (the main wave band is 8-13 mu m) is improved, and heat is emitted to deep space through an atmospheric window, so that the temperature can be reduced to be below the ambient temperature even under the irradiation of the sun. With the intensive research on radiation refrigeration technology, the measurement of the cooling power of a material becomes an indispensable part. The comparative cooling amplitude test is limited by environmental climate, longitude and latitude and the like, and the cooling power measurement can more objectively reflect the cooling performance of the material and is beneficial to transverse comparison and standardized measurement. In 6 months 2020, new raining energy science and technology provides an integral device comprising a container with a measurement chamber, an atmosphere inverse radiation simulation assembly and an atmosphere window simulation assembly, and the integral device is used for measuring radiation cooling power indoors. However, the device is complex, the material needs to be kept consistent with the ambient temperature through heating, and the adjustment time, the overshoot and the static error are not guaranteed when the temperature changes. Therefore, the simple mode for realizing the breakthrough in the aspect of representing the cooling power still exists.
The existing market has no special measuring device for cooling power, the measuring method used in a laboratory is to realize temperature control by utilizing a controller under PID (proportion integration differentiation) regulation, the electric power consumed by a heating plate is represented as cooling power, the realization difficulty is high, the cost is high, and the temperature regulation is not easy to realize.
SUMMERY OF THE UTILITY MODEL
For solving the complicated, higher problem of the degree of difficulty of measurement radiation cooling power device, this application discloses a measurement device of radiation refrigeration cooling power adopts following technical scheme:
a radiation refrigeration cooling power measuring device comprises a radiating fin, a heat conducting layer, a temperature difference resistance piece, a substrate layer and a power meter; the radiation refrigeration cooling device comprises a temperature difference resistance piece, a substrate layer, a radiation refrigeration cooling material layer to be detected, a temperature difference resistance piece, a temperature difference sensor and a temperature sensor, wherein one side of the hot end of the temperature difference resistance piece is provided with a heat conduction layer, the bottom of the heat conduction layer is provided with a cooling fin, one side of the cold end of the temperature difference resistance piece is provided with the substrate layer, and the upper surface of the substrate layer is provided with the radiation refrigeration cooling material layer to be detected;
the radiating fins, the heat conducting layer, the temperature difference resistor and the basal layer jointly form a temperature difference power generation piece;
the power meter is connected with the hot end and the cold end of the temperature difference resistor through leads to form a closed loop.
The preferred scheme is as follows:
also comprises a heat preservation box; the top of the heat preservation box is hollowed and covered with a layer of light-transmitting film, and the side wall of the heat preservation box is provided with a plurality of through holes; the temperature difference resistance piece, the stratum basale, the cooling layer sets up inside the heat preservation box, and the power appearance sets up in the heat preservation box outside.
The base layer is made of metal or glass.
The heat preservation box is made of polystyrene. The heat conductivity coefficient is low, and the influence of an external heat source can be effectively reduced.
The material of the light-transmitting film is polyethylene. The radiation cooling material layer to be detected can exchange heat with deep space through an atmospheric window under the radiation action.
Further comprising: the system comprises a wireless communication module and an upper computer; the measured data in the power meter is transmitted to the upper computer through the wireless communication module, and the upper computer is used for data processing and outputting the radiation refrigeration cooling power of the radiation refrigeration cooling material layer to be detected.
The wireless communication module includes: the wireless communication module comprises a WIFI module, a Bluetooth module, an infrared module and an LTE cellular data communication module.
The working principle of this application does: the thermoelectric generation piece directly converts heat energy into electric energy by utilizing the Seebeck effect. The cold end of the TEG is placed with the film material, the hot end is directly contacted with the environment, and the two ends generate temperature difference. Through the Seebeck effect, the current is generated in the formed line, so that electric power is supplied to the outside. In the radiation refrigeration cooling power measuring device, a radiating fin, a heat conducting layer, a temperature difference resistor and a substrate layer form a temperature difference power generation sheet (TEG) together; during measurement, the radiation refrigeration and cooling material layer to be measured is fixed on the basal layer by using heat-conducting silica gel, sealing and heat preservation work are well carried out, and the radiating fins are fully contacted with ambient air. At the moment, the temperature of a cooling layer (thin film material) at the cold end of the TEG is reduced through radiation refrigeration, the temperature of the cooling layer is transferred to the substrate layer through heat conduction, the temperature of the hot end is basically consistent with the ambient temperature under the action of the radiating fins, the TEG can generate voltage and current according to the temperature difference of the cold end and the hot end, the power meter calculates electric power through P = UI after collecting voltage and current data from the TEG, and the output electric power of the TEG is converted into cooling power according to the relation between the electric power and the radiation refrigeration cooling power.
The TEG measurement cooling power has the following main functions and characteristics: when the electric power is generated, the power measurement can be completed without an indirect conversion process, without depending on external components, additional power supply and additional controllers and heaters, and the direct conversion from heat energy to electric energy can be spontaneously realized; simple, easy measurement, maintenance cost are low: compared with a mode of indirectly enabling the heating power to be equal to the cooling power by using temperature control, the electric power output by the TEG is more convenient and simpler to correspond to the cooling power; the TEG is used for measuring the cooling power, no harmful medium is used, and the method is safe and reliable to human bodies.
Drawings
FIG. 1 is a schematic view of a device for measuring radiation refrigeration cooling power;
FIG. 2 is a schematic structural view of the heat preservation box;
wherein: the device comprises a radiation refrigeration and cooling material layer to be detected 1, a radiating fin 2, a heat conducting layer 3, a temperature difference resistor 4, a basal layer 5, a light-transmitting film 6, a heat preservation box 7, a through hole 8, a power meter 9 and an upper computer 10.
Detailed Description
The present application is further described with reference to the following figures and examples:
example one
As shown in fig. 1: a radiation refrigeration cooling power measuring device comprises a radiating fin 2, a heat conducting layer 3, a temperature difference resistance piece 4, a substrate layer 5 and a power meter 9; wherein one side of the hot end of the temperature difference resistance element 4 is provided with a heat conduction layer 3, the bottom of the heat conduction layer is provided with a radiating fin 2, one side of the cold end of the temperature difference resistance element 4 is provided with a substrate layer 5, and the upper surface of the substrate layer is provided with a radiation refrigeration cooling material layer 1 to be tested;
the radiating fins 2, the heat conducting layer 3, the temperature difference resistance piece 4 and the substrate layer 5 form a temperature difference power generation sheet (TEG) together;
the power meter 9 is connected with the hot end and the cold end of the temperature difference resistance element 4 through leads to form a closed loop.
The power meter is used for measuring voltage and current, calculating electric power and cooling power, the base layer is positioned on the uppermost layer of the device and is used for placing a radiation cooling material layer to be measured, the temperature difference resistance piece is positioned between the base layer and the heat conduction layer, one surface close to the base layer is used as a cold end of the TEG, and the other surface close to the heat conduction layer is used as a hot end of the TEG; the radiating fins are positioned on the back of the heat conducting layer, so that heat can be exchanged with the external environment to the maximum extent, and the temperature of the hot end is kept consistent with the temperature of the environment. And the power meter is connected with output wires at the cold end and the hot end of the TEG to obtain a power value.
The cooling power is a variable influenced by temperature and is the characteristic of the material. The physical characteristics of the film material are changed by manufacturing a micro-nano structure on the film material, so that the reflectivity at a solar wave band is improved, the emissivity of 8-13um (a radiation wave band capable of passing through the atmosphere) is improved, and the material temperature is lower than the ambient temperature in the daytime.
Example two
As shown in fig. 2, a device for measuring radiation cooling power further includes, based on an embodiment: a heat preservation box 7; the top of the heat preservation box is hollowed and covered with a layer of light-transmitting film 6, and the side wall of the heat preservation box is provided with a plurality of through holes 8; the temperature difference resistance piece 4, stratum basale 5, cooling layer 1 set up inside the heat preservation box, and the power appearance sets up in the heat preservation box outside.
The heat preservation box top is provided with the fretwork opening similar with the radiation refrigeration cooling material layer size that awaits measuring, guarantees that furthest carries out the heat exchange through the atmospheric window. The temperature difference resistance piece 4, the stratum basale 5, the cooling layer 1 sets up and is favorable to maintaining TEG temperature stability in heat preservation box inside, can effectively reduce thermal diffusion and wind-force influence, has certain heat preservation effect to internal environment.
EXAMPLE III
A radiation refrigeration cooling power measuring device further comprises on the basis of the first embodiment: a wireless communication module and an upper computer 10; the data measured in the power meter are transmitted to the upper computer through the wireless communication module, and the upper computer is used for processing the data and outputting the radiation refrigeration cooling power of the radiation refrigeration cooling material layer to be detected.
The wireless communication module includes: the wireless communication module comprises a WIFI module, a Bluetooth module, an infrared module and an LTE cellular data communication module.
The temperature difference resistor comprises a plurality of pairs of N-type semiconductor units and P-type semiconductor units; the N-type semiconductor unit and the P-type semiconductor unit form a couple pair. Under the condition that the temperatures of the two ends are different, the current carriers at the hot end have larger kinetic energy, are diffused and accumulated towards the cold end, the number of the current carriers at the cold end is larger than that of the current carriers at the hot end, the charges accumulated at the cold end establish an electric field in the conductor to prevent the further diffusion of the current carriers, and when the conductor is balanced again, electromotive force is formed at the two ends of the conductor.
According to the seebeck effect, the thermoelectromotive force is:
wherein
The relative seebeck coefficient is determined by the properties of the semiconductor material,
is at the temperature of the surroundings and is,
is the TEG cold end temperature.
And the relation among the power generated when the cooling material radiates for refrigeration is as follows:
wherein the content of the first and second substances,
in order to net cool down the power,
is the power of the radiation of the material,
in the form of solar radiation, is,
is a heat radiation of the atmosphere,
in order to exchange heat power with the environment,
is the material temperature (i.e. the cold end temperature),
is ambient temperature.
Wherein A is the area of the material,
in order to be able to measure the spectral and angular emittance,
is the integral of the angle of the hemisphere,
is the black body spectral radiation at the temperature T,
is the wavelength of the light.
Assuming vertical emission, consider the 8-13um wavelength range:
wherein the content of the first and second substances,
、
、
、
t is the temperature of the temperature lowering layer (thin film material).
、
、
The process can be analyzed in the same way.
Finally, with the help of a software polynomial fitting method, the following can be obtained:
wherein, the first and the second end of the pipe are connected with each other,
in order to reduce the temperature of the power,
to output the electric power for the TEG,
etc. are constants.
It can be seen that the radiant cooling power can be determined by measuring the electrical power.
In one example, when a polyvinylidene fluoride (PVDF) doped nanoscale air bead film material (thickness of 1 mm) is measured, the PVDF doped nanoscale air bead film material is attached to a substrate, a device is connected, a power meter measures that TEG output voltage is 28.8mV and current is 59.7uA at the moment, data is transmitted to an upper computer through a wireless communication module and passes through the wireless communication module
The calculation of the mathematical model relation shows that the output cooling power is 69.2W/m ^2. The theoretical calculation value is 66.7W/m 2 and the error value is in a controllable range after being consulted by the literature.
Claims (8)
1. A radiation refrigeration cooling power measuring device is characterized by comprising: the temperature difference resistance device comprises a radiating fin, a heat conducting layer, a temperature difference resistance piece, a substrate layer and a power meter; the radiation refrigeration cooling device comprises a temperature difference resistance piece, a substrate layer, a radiation refrigeration cooling material layer to be detected, a temperature difference resistance piece, a temperature difference sensor and a temperature sensor, wherein one side of the hot end of the temperature difference resistance piece is provided with a heat conduction layer, the bottom of the heat conduction layer is provided with a cooling fin, one side of the cold end of the temperature difference resistance piece is provided with the substrate layer, and the upper surface of the substrate layer is provided with the radiation refrigeration cooling material layer to be detected;
the radiating fins, the heat conducting layer, the temperature difference resistance piece and the basal layer form a temperature difference power generation piece;
the power meter is connected with the hot end and the cold end of the temperature difference resistance element through leads to form a closed loop.
2. The device for measuring radiation refrigeration cooling power according to claim 1, wherein: also comprises a heat preservation box; the top of the heat preservation box is hollowed and covered with a layer of light-transmitting film, and the side wall of the heat preservation box is provided with a plurality of through holes; the temperature difference resistor piece, the basal layer and the cooling layer are arranged inside the heat preservation box, and the power meter is arranged outside the heat preservation box.
3. The device for measuring radiation refrigeration cooling power according to claim 1, wherein: the base layer is made of metal or glass.
4. A device for measuring radiation refrigeration cooling power according to claim 2, characterized in that: the heat preservation box is made of polystyrene.
5. The apparatus for measuring radiation refrigeration cooling power of claim 2, wherein: the material of the light-transmitting film is polyethylene.
6. The device for measuring radiation refrigeration cooling power according to claim 1, wherein: further comprising: the system comprises a wireless communication module and an upper computer; the measured data in the power meter is transmitted to the upper computer through the wireless communication module, and the upper computer is used for data processing and outputting the measured radiation refrigeration cooling power of the radiation refrigeration cooling material layer to be measured.
7. The device for measuring radiation refrigeration cooling power according to claim 6, wherein: the wireless communication module includes: the wireless communication module comprises a WIFI module, a Bluetooth module, an infrared module and an LTE cellular data communication module.
8. Radiation refrigeration cooling power measurement device according to one of claims 1 to 7, characterized in that: the temperature difference resistance piece comprises a plurality of pairs of N-type semiconductor units and P-type semiconductor units; the N-type semiconductor unit and the P-type semiconductor unit form a galvanic couple.
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| CN202222090263.9U CN218331735U (en) | 2022-08-09 | 2022-08-09 | Radiation refrigeration cooling power measuring device |
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| CN202222090263.9U CN218331735U (en) | 2022-08-09 | 2022-08-09 | Radiation refrigeration cooling power measuring device |
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